b 
82 AN ACCOUNT OF BRITISH FLIES. 
‘ 
H.. Poe, Bosc. = H. graminicola, Wtz. 
The larvee of this species form rough brown oval galls on Poa nemo- 
valis, and pupate in these galls. 
& Whitish-yellow. Pectus and metathorax dark brown. Antennz 
grayish-brown, yellowish in places. Wings limpid; legs brown. 
Antenne, 19-20-jointed ; shorter than the body ; the joints are twice 
the length of petiole. The abdomen is dark brown, the sutures being 
lighter, sometimes yellow. 
2 Abdomen tawny ; the posterior borders of the segments have 
brown bands on them. Antenne, 19-jointed and half the length of 
body. Joints much longer than the petioles. Tip of oviduct ex- 
panded, no valves. 
HT. piligera, Lw.=annulipes, Hartig., Wtz. 
The hairy galls on the leaves of Fagus sylvatica are the home of 
the larvee of this “ gnat.” 
& Dark brown; palpi yellowish-brown; antennze longer than 
body, joints longer than petioles ; dark brown. Sides of thorax and 
abdomen flesh-coloured. 
? Antennz as long as head and thorax ; joints not petiolate. Ovi- 
duct long, yellow, no valves. 
The joints of the antennz are from 17 to 20 in number. 
fT, fasciata, Mg. 
? Brown; antenne 14-jointed. Thorax yellowish-brown ; three 
dark brown stripes and a black spot on each side behind. Pectus 
dark brown, Abdomen yellowish-white, with a black shining band 
on the posterior margin of the first to seventh segment. PI. ii. (1). 
HT, Ptarmice, Vallot= H. floricola, Wiz. 
One often notices the flowers of Achillea Ptarmica deformed and 
stunted ; this is generally due to the attack of the larvz of this gnat, 
which live in the deformed flower-heads, 
& Black ; dark pubescence ; antennz brown, 18-jointed. Antennz 
shorter than body, joints twice length of petioles. Sides of thorax 
brownish-red to pink. Wings broad and milky. Abdomen brownish- 
yellow. Legs dusky brown, silvery hairs beneath. 
? Antenne only half length of body; joints five to six times the 
length of their petioles. Abdomen flesh-coloured. Legs have white 
pubescence beneath. Oviduct elongated. Length 1 lin. I find 
this first mentioned in “The Memoirs of the Academy of Science, 
Dijon,” for 1849. 
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